Frequencies for first 10,000 rows of op_srvc_cd variable in pos2012 dataset :

   Services |
  Provided: |
 Outpatient |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,606       86.06       86.06
          0 |        317        3.17       89.23
          1 |        953        9.53       98.76
          2 |         42        0.42       99.18
          3 |         82        0.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016